Problem Description: The extension fails to properly encode extension information in its edit mask. An admin backend user is needed to exploit the vulnerability.

Solution: Versions of this extension that are known to be vulnerable will no longer be available for download from the TYPO3 Extension Repository. The extension is no longer maintained and the author will not provide a security fix for the reported vulnerability. Please uninstall and delete the extension from your installation.

Credits: Credits go to Oliver Klee who discovered and reported the vulnerability.